Kate Middleton donned a light blue Elie Saab dress detailed on lace and a pussy bow for the first day of the event of racing horse.
The duchess accessorized his outfit with a matching hat, silver clutch and silver heels. Her hair was swept on a braided chignon edge.
The Duchess did not attend Royal Ascot last year after she was born in Prince Louis in April.
Royal Ascot is one of the most anticipated social events in the United Kingdom. It was attended by the queen and other royal family members.
In addition to exciting horse races, the event features some serious fashion from attendees.
Like Middleton, Queen Elizabeth, Princess Beatrice and Princess Eugenie also wore a shades of blue this year.